Scholarlink

<p>Increasing kraft pulp yield has long been a critical objective in the pulp and paper industry. In recent years, methyl mercaptan (MeSH) has been recognized as an effective additive for enhancing kraft pulping yields in both softwood and hardwood. To elucidate the underlying mechanisms, this study investigates the impact of MeSH introduction on bamboo kraft pulping, with a focus on understanding its role in enhancing delignification efficiency and protecting carbohydrates. A comparative analysis on kraft lignin reveals that MeSH introduction significantly reduces lignin’s molecular weight by approximately 30%, and the phenolic hydroxyl group content drastically increases by 21.7%. That promotes the dissolution of kraft lignin in pulping liquors, thus accelerating delignification and shortening H-factor by 29.5% and lowering alkali charge by 2%. Analysis of polymerization degree (with a 56% reduction in its decrease) and reducing end group content (decreasing by 12%) in cooked dissolving pulps verifies that MeSH inhibits both carbohydrate peeling reactions and alkaline hydrolysis, and the primarily contribution is on the protective effect on cellulose (82.1%). Therefore, we believe that the main mechanism using MeSH as additives includes two aspects, i.e., accelerating delignification and preventing carbohydrate degradation, which collectively promotes the yield increase of bamboo kraft pulp by 2.8%.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mechanism on improving delignification efficiency and pulp yield in bamboo kraft pulping through methyl mercaptan introduction

  • 期刊论文

  • 发表日期：

    2025年9月30日

查看全文
  • Peiyuan Li,
  • Songnan Hu,
  • Suyue Huang,
  • Saisai Zhang,
  • Hui-Chao Hu

摘要

Increasing kraft pulp yield has long been a critical objective in the pulp and paper industry. In recent years, methyl mercaptan (MeSH) has been recognized as an effective additive for enhancing kraft pulping yields in both softwood and hardwood. To elucidate the underlying mechanisms, this study investigates the impact of MeSH introduction on bamboo kraft pulping, with a focus on understanding its role in enhancing delignification efficiency and protecting carbohydrates. A comparative analysis on kraft lignin reveals that MeSH introduction significantly reduces lignin’s molecular weight by approximately 30%, and the phenolic hydroxyl group content drastically increases by 21.7%. That promotes the dissolution of kraft lignin in pulping liquors, thus accelerating delignification and shortening H-factor by 29.5% and lowering alkali charge by 2%. Analysis of polymerization degree (with a 56% reduction in its decrease) and reducing end group content (decreasing by 12%) in cooked dissolving pulps verifies that MeSH inhibits both carbohydrate peeling reactions and alkaline hydrolysis, and the primarily contribution is on the protective effect on cellulose (82.1%). Therefore, we believe that the main mechanism using MeSH as additives includes two aspects, i.e., accelerating delignification and preventing carbohydrate degradation, which collectively promotes the yield increase of bamboo kraft pulp by 2.8%.